US Secretary of State John Kerry dismissed the idea that Iran could maintain its current number of nuclear enrichment centrifuges as part of a long-term deal with six world powers that would lead to a gradual end of sanctions.
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Iran has installed 18,000 uranium-enrichment centrifuges, the country's outgoing nuclear chief was quoted as saying by Iranian media on Saturday.
The US and its Western allies are pressing Iran to curb its uranium enrichment p

Iran is building about 3,000 advanced uranium-enrichment centrifuges, Iranian media reported on Sunday, in a development likely to add to Western concerns about the Islamic state's disputed nuclear programme.
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Iran has begun installing advanced centrifuges at its main uranium enrichment plant, the UN nuclear watchdog said, a defiant step that will worry Western powers ahead of a resumption of talks with Tehran next week.

Iran appears to have nearly finished installing centrifuges at its underground nuclear plant, Western diplomats say, potentially boosting its capacity to make weapons-grade uranium if it chose to do so.

Secretive North Korea detailed for the first time its expanded nuclear programme on Tuesday, saying it had thousands of working centrifuges, as pressure built on China to rein in its ally amid tensions on the peninsula.&nbs

Iran has been experiencing technical problems with equipment in its uranium enrichment programme but it is unclear to what extent the Stuxnet computer worm may be to blame, Western diplomats said.
One senior diplomat said it was his unders

Iran is involved in production of new generations of uranium enrichment centrifuges and plans to use them by March 2011, the head of Iran's Atomic Energy Organisation told the semi-official Fars news agency on Friday.
'We are produ

Iran has built a new generation of centrifuges for enriching uranium and is testing them, the official news agency IRNA quoted its nuclear energy agency chief as saying on Tuesday.
"Iranian scientists have made a new generation of centrifu

Iran now has 5,000 working uranium enrichment centrifuges, a senior official was quoted as saying, signalling an expansion of work the West fears is aimed at making nuclear bombs.
"Now we have 5,000 running centrifuges," Gholamreza Aghazad